Questions and answers by

christinaqz

Questions (41)

When are larger atoms least likely to be reactive?a. When they have no valence electrons. b. When they have more than 8 valence
1. 1 answer
2. 163 views
Ionic compounds _____.a. are all solid at room temperature b.conduct electricity as a solid c. can be solid or liquid at room
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2. 211 views
Which of these properties describes a diode?a. able to switch an electric current on and off b. able to change direct current
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2. 190 views
Why does baking bread require a constant input of heat from the oven?a. It is a chemical reaction. b. It is a physical reaction.
1. 1 answer
2. 170 views
The pH scale measures _____.a.the strength of an acid b. the concentration of hydrogen ions c. the strength of hydrogen ions d.
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2. 129 views
How is a turbine used in generating electrical energy?a. The armature of the generator turns the turbine. b. The turbine turns
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2. 148 views
Which can produce a magnetic field?a. moving water b. insulators with conductors c. an electric current d. a solid state
1. 17 answers
2. 192 views
When a solution forms, what happens to the individual particles of a solute?a. They precipitate. b. They combine. c. They
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2. 112 views
Which statement accurately describes electric charges?a. They flow easily through all materials. b. They flow easily through
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2. 219 views
What directly controls breathing, heartbeat, and muscle movement in the human body?a. electrical signals b. variations in
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2. 152 views
If a bicyclist travels 30 kilometers (km) in two hours, what is their average speed?a. 30 km/h b. 15 km/h c. 2 km/h d.60 km/h
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2. 134 views
A refrigerator is rated at 500 W and requires 4.545 A to work properly. Which plug should that refrigerator be plugged into?a.
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2. 162 views
How can the concentration of a solution be increased?a. More solute can be added. b. By decreasing the temperature. c. By
1. 1 answer
2. 133 views
Why don’t water and oil mix when the two liquids are poured into the same container?a. Water is nonpolar and oil is polar. b.
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2. 214 views
The pits and flats on a CD are an example of information stored as which type of signal?a. digital b. amplified c. analog d.
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2. 131 views
What is the name for the rate at which work is done?a. energy b. joules c.newton-meters d.watts
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2. 125 views
What is one way to increase the solubility of sugar in water?a. Raise the temperature of the water. b. Lower the temperature of
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2. 126 views
Which type of property is magnetism?a. nonmetallic b. chemical c. physical d. nuclear
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2. 127 views
In an electric motor, a commutator _____.a. repeatedly reverses the flow of current through the armature b. is a permanent
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2. 167 views
Which temperature scale is most commonly used outside the United States?a. Celsius b. Thomson c. Kelvin d. Fahrenheit
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2. 157 views
Which type of energy depends on position?a. electrical energy b. solar energy c. magnetic energy d. potential energy
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2. 110 views
Which type of light does a flashlight produce?a. cold light b. incoherent c. coherent d.white light
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2. 211 views
Why are distant galaxies and stars so hard to see?a. because they are so bright, the amount of light must be reduced b. because
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2. 114 views
Which is a curved piece of glass or other transparent material used to refract light?a. a concave lens b. an optical fiber c. a
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2. 133 views
How are different wavelengths of light affected by entering a prism?a. the shortest wavelengths are refracted the least b. the
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2. 183 views
What does a concave lens look like?a. flat on one side and bulges out on the other side b. the same thickness in the middle and
1. 1 answer
2. 140 views
How does a refracting telescope change the image seen by a scientist?a. It uses two mirrors and a convex lens to make small
1. 1 answer
2. 191 views
What do refracting and reflection telescopes have in common?a. They both use a convex lens in the eyepiece to focus light. b.
1. 1 answer
2. 168 views
What do refracting and reflection telescopes have in common?a. They both use a convex lens in the eyepiece to focus light. b.
1. 1 answer
2. 190 views
What is the result of the use of optical fibers in knee surgery?a. The recovery is easier. b. The fibers are strong replacements
1. 1 answer
2. 171 views
What is needed to build a laser?two fully reflective mirrors two partially reflective mirrors a partially reflective mirror and
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2. 178 views
Total internal reflection _____.causes light rays to travel in parallel lines through optical fiber allows no light to escape
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2. 167 views
What is necessary to achieve total internal reflection?a large angle of incidence a mirror a small angle of incidence an optical
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2. 129 views
What is necessary to achieve total internal reflection?
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2. 106 views
Which of the following is not a typical benefit from the use of optical fibers for surgery?Surgeons can repair damage to joints,
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2. 166 views
Which of the following is not a typical benefit from the use of optical fibers for surgery?
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2. 149 views
Total internal reflection _____.allows no light to escape from an optical fiber allows most laser light to be reflected inside
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2. 189 views
What is necessary to achieve total internal reflection?a small angle of incidence a large angle of incidence a mirror an optical
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2. 143 views
Which statement is not true of optical fiber?a. Optical fiber can be made either of glass or plastic. b. Optical fiber
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2. 204 views
In an operating room, which device would you not expect to find connected to an optical fiber cable?scalpel camera monitor
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2. 117 views
Total internal reflection _____.allows most laser light to be reflected inside an optical fiber causes light rays to travel in
1. 1 answer
2. 183 views